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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7746d12c750150ff935709e00abec992d3aaec6adfb32d787eae07c4c560581' 
  AND token = 'm/rvWV/XgNbsm9sWMzhc33m4/1nwWPJp32PzoskM2+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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