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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1e7c9a693c939dd026ab4da3e0efe767f373a9feb00df2e9fa7eddfb23bf3f' 
  AND token = 'laZspEbI7ehekRPYQRo0l99Wg+DRH49yO4w/U96ePRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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