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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8bc11e06e518246cbf0bccf687b665671209e58007cfd7d2564574ac7916747' 
  AND token = 'ieNvqxX06m53BCLxb8TUCfOZDYiKsDpDgjf9M0mV7HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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