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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99e147cc5ad925ed0dc9188889000ef7aa01df254920dc50a6903ba9a9b70f7' 
  AND token = '74epWF9D+IVLzNQFmS5G962dXiLvHvcXGE8Fa+BYpNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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