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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5db07a307edbcc695576dd7755a78478e4a8220cca488dd3966998ee129098b' 
  AND token = 'f4JrnD9CHDJ0gb6u6ewBn/dFvDqoV81gkzo6/f1yZOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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