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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26f4673deec48c78e77fc77ea3626b1de2e24015aae79ec75ca89f17f3a93b4a' 
  AND token = '7Z7Y3IEqbIhYn47a56kmmBUt4SPWdc0YAHlZYHJEaTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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