SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd66a2f9bab012c6b3ebf9e4b61323b8ae23751124f4fced3f2fdb8024ca1d4c' 
  AND token = '9SwOPzU++IkmKM1whjSVv9ESuDbFjZjGYVYjp9ik9To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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