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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd91eef155665499f57b7de896d584be3863f92f40d168c1bb6f872b8b9a66e8' 
  AND token = '1Tnutuh+uvYfWB2MBb6AhlgbtqknngFcysMhIEfKfDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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