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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58f04f3a237f97e8ab80f96e3b3d47af4d3e850d19b31b4bb1e83c654829003c' 
  AND token = 'TkPM4iS3bV5CvG1jwkOW52pirZmjk5y4F7ajKX9dXj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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