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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6284e2d178c2688e21484377b9a8fd0dc4e115c9dae2f2e5802e76931cd0392e' 
  AND token = 'QR1A4QIUL0PSJ4oB1RyyCQ1UJO3yI/cXaeukPmbqBXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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