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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1747c8385fe3ff2c3e3621d96cd0d1b90090fb93171fc23e4244f422e80080c3' 
  AND token = 'yWEeeQK8QwbWoUaMUMXvO5VOqcBLzAOV2C9lF73GTyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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