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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99247e9d41fcfad2360c3ec78668b4d994bda069888e99f93f6676f473f3af58' 
  AND token = 'YQ6JhHQiCI8LpTPXbTymElWmTKoKRKZQi+4gvJ+8Rak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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