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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce74d226cf1c4de889e38e1fec788b782181b8dedeb44bc6433976e97b0e810' 
  AND token = 'I+4pGXP7rT0tS+WYLNra5jk8PRI1XidfZI7r/WSkcDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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