SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e497893568932203ca581dbe4f80cdfbc82264faf46f3a231e48d4156c2c0fbd' 
  AND token = '8oYLxLUVGSNz7FnRClB7Bh+jieX8RAYxxt/rybvpQVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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