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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ae05faf32ac0fff8cb96c8b06720e16182f84e2faa35db11ec5ac3fd36a3d1' 
  AND token = '/Vmd84RIc68IPIi5iOnGYuZ5eINFrfDg6nxvjh5OOE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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