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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c60af341eba872aa291ac6852be0a3169734a8c599e34de7458d661e908639' 
  AND token = 'fYax0RVxyaRddlLyWWpIlVwjqr3S6vp5ZEn54ZDPSWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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