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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '396eb194c74c16f5a30658f46701d0be43ebac357053927708da7c9c0dab02bb' 
  AND token = 'C7un4ckRAWm7Ioz1f8i3FpNChdH8CoQBY/g8jxIdr2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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