SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa0183f15ecf81d9b3ed71432d993d7d5d839c4aa6a28b345a6a599f4146426a' 
  AND token = 'glC3oQvhY7CIRWGgwkWpBudTehqig8MBaW8xXL7sRXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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