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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b96d92662af251a78cc940bb5268bbd934f28a7014ca88ca5d5415c5a90fe8' 
  AND token = 'Apmeu9OwfG0/w67h4Mw4YPdog80R9x9twmCD5PeBh2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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