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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d17855a5f3bef77a39173fafb7dd97638224c64ae219b7eb4bb7f67f1c6da8' 
  AND token = 'IjrqSkX72yZeYyOGQka89JXuvVBSC2x3qN7BP294qO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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