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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4acbbda33c232574356a0e9e1e7252ecffcaef74f1e8887e1d2fe495ed8fdd51' 
  AND token = 'IiPGxdK4zq0RSPj6dXYBwE6fOBz37sm9bqc08pP98os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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