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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b9506369537908336b46e42c18640b878083f1e2b138899dd8c7029a5322fb4' 
  AND token = 'oAeagPLf2yD6H5gYgvEveZp8pfDB3AaKJbFUE91XUJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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