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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0bb5d8d76ab508e280f80c99d85201b17fd84377ca24b8c82c3ccf9e4a6d81a' 
  AND token = 'zOLu1pfV+Qi86ArnkcV1IqiVzY6i1VDlGo1hy+QR02I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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