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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c54ccdf81a01bcbed526b0c55d102ea24194e9b480594e91d869e7749caa5d' 
  AND token = '4bB9+u7uKZh1XfIhPIM+JANyezyhMX38LPRP83MBK8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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