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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf99035340ae031a492906869696ed1d604bfb5794b815e5981d5f8d941243ed' 
  AND token = 'uMDPfR1vN6Q3NzDs3CM4P7dXWBkN6tSOiulm/hnbWpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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