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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fd0279113c8f7730cb34da68b38f6601d1115ce8dea8b2425509e18bd6df5b8' 
  AND token = '3QC+BOvJVVa2GEK6hSkAlZnT0sx3TeW52sP1jhvuj1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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