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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aaace7e202ef58955810e04d3b21de70b70101508b3cc762d797fbee4daeb8c' 
  AND token = 'Wx6zU4EsLNIyQBx2Ljw/KSAvdbHLtGB2zuyp0Nd/bcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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