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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dff2af4693b22cc08b911868cc52276971a4c505e3c6d033f5a7012dedbb59f1' 
  AND token = 'v+uj6y3lfIoLOLijyyvncS+r8B+crs15AWb8P/3Ssos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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