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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c81394e6ca22ad1348dc4951102592a3b7d391a2112b9528f711cd1ee525b72' 
  AND token = 'HhVWQ9lQk7s0J2fSe+z03MPhk8KZoC6RBTcZUzFErKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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