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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77b3a8c71bcbba182edff04fbac904a4e12d1706250e6fd17064f7a609b7666b' 
  AND token = 'XcLAEKR3qZVH6Eo7qZ4TDrUK8v2NJZl4i6rV0PjyXcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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