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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b217ed4ed87d93f2b6a4d9d1e6b4284c93a5ba700432da9492b462cdb3e8260' 
  AND token = 'cPyxZCV2VIHqlgmgAbge1IbiUC2yVhJQM6j7Fh9hDg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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