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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a61c8f82c8f45206685830aa393f2c1462bc01187449ace56caed5b1af2b56' 
  AND token = 'qQadrKDspzI0rZis1Jk2PFzM2id9yHMK6+yF5/ZV6Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}