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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2688678f5329ff354e16828df3e6687d497fe9e7dcb9f49ff516dd32e0e61d83' 
  AND token = 'nYq0VsM7vzKpU6MU6/VnZ8grH359+0midMNyk8WfN6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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