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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4992ecd1739f50c13af6bb8237bfcd64c90aa24b7f966a67cf7f9f5d3a2752a' 
  AND token = 'E8wMv2W9Pd86W17L8fxR9qZxXVx7/yR1QD8NRVJw53I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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