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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbaaa0db92286f8d1a64043f98540f4b6db6c4cf74a99b3fdbb8834f34b52184' 
  AND token = 'HBhJF1mCWP5mBNoD80H3sN5I08xJzx1UfQlobRxoNM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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