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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39317ce24f50b44acab7b4e44ec5159e0434fe35810005aa4e2877ad5234783e' 
  AND token = '3zHLQuZlpp0g82z5M5Z3FZVVqMolJPRJCo5OcrxwgTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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