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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac0041e411bb5f23744b3a0cc09c78ac12b9a6999c960d7f169e3af723f8f7b' 
  AND token = 'wa8vn1LCi0AE6JldY1RitKT/IV8Ez73CmiKBvWt7xZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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