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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d89591611f6bc464f4cd5a5978ffb8cdaf3d0dbb15325b0de32d513c77f96cb' 
  AND token = 'wnnvczJlKMUscadqzl5eSlt8FnzNqxqeYJaIoXCDAtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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