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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd441a74b325e41d3e2eada6dd40389b894252e11e20bcc9a808583902231b5' 
  AND token = '/EZKwg85X5Hq0JuLZkE2O5X2G6G4Gs5GPze9qsiozVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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