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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f882a09e397694acbe2e5ef9765b21257fe65c03b6568d0cafd9ba0602e526' 
  AND token = 'FfdQLFXbOnBLLKl35KUKneVYx0Q6u0fi3DzU7Lk8uEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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