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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5629c3c8699a7bac2e5acb3e90f5daf78f8de805e5f114737997cc8f10a4af3' 
  AND token = 'tUE60iiBl7tAryscAolTIVWzmvq1miXmtiN8e/f3eBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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