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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e498254faea7489aefc21ca4967115adf47486f9b946b17426fcbaa41b0917' 
  AND token = '4evU13xPDh7l/J/9Cv+AE/27OW3YBaH8rx0q80lXRDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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