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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b72430a3e29ed97f7b8749b61cb8c0c2b9caa4ae803cb7d76babddc1e99c6eca' 
  AND token = 'cJ1bSKGuRS2cZQTckgt+WPOATt/zf4qvNEAgX4YU7Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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