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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32670e0050732d9987dffc52f4e718dea944617bf55ec470b4637c4bbd7dd646' 
  AND token = 'jEuGS8CqX1iHUOIfjTxRs6ahNEB3iwdgXrYdWLPHChg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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