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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b6f33994df336125d4257d801eed359d2883fd67c57eba127115a7ea739d0d' 
  AND token = 'ckw6nFncpmCptKCw5PAw//5U/sgrixxAC97Ro8Pfy9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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