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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '955db01115fc49762ce5c29facf3b062438b4ed6b7407c6ed122a6fa759faa68' 
  AND token = '2UC5hZ06IxprUKyiDncPv8Xngfe+C6NJoFyTZPqE/AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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