SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b214533d727619fff9fc9e99bda489e03f35c74a7eb29076d66158e1af538f82' 
  AND token = 'kCGLsTFE/JB1pxmYeUw/O9JVyDPb/537Rsmm1ZGOk1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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