SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45aefbe634b16c07c07bddf8749b63af7f364729cf2c03a32c377c3beb0540f0' 
  AND token = 'dShk2rgRdVqwC5+AWv+u0TnCm9Ozg/slGSnmZ1w7Hlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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