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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0480bf58f906fc79c6934827319cd9ad8320d3959cb0a9e62c33b2846e6dbc' 
  AND token = 'nomCr2m4oAQgZ7sy1ZjrW4Ad2cSRCtXuqllIlpkONvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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