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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1da41b5fe4f1205bda3e0fda9602e97195ca422fc26ea0e8b14a78deb012120' 
  AND token = 'p+tHJYUd2fpfAPOfnYG5NVcU2i7hFoH6CIAlB1pEVow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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