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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2251253e89b216f9a966f3034f7c1ee4a50791c5c572e5fe62cdeb35c924eb67' 
  AND token = 'hhl3bY77McWKC6MugkbyK4xQxgdTOBRa84AJGdZ/e4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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