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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '892d26493160a84470fdf3b09de85d95a053379e35742318cdf82d8f1935d204' 
  AND token = '7ZId5pBVCTj6F21NYyqEjFe4nVMAUDrCnen3uquiYM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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