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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab618d4b081b745879e42ef4684496482c30b9b7b9c961108894d5ccecc8902' 
  AND token = 'yqcWtusWlTa+rHEPZyuJ4ppCTCZw9O5wDxoq7QCh7t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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