SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f2a13138d4977d67b595220aac5711d16ca8f6d84968661111f358191ba226c' 
  AND token = 'IpHKOURUPVvbpPqPxemdIkVYSlXL7FhHQXKQ4x3j+Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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