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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2b2b8301ae265cbd9bdaa3ba04e3771cf6546a2a3bd92b5eef2d0318f0dc400' 
  AND token = 'j/Pxm2nGYQ4YlsVp7y9gF3zty9IxauroC2f4stk+oF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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