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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '334862b388cd5cbbe4705fc2810043e5f0f3258814fe0199ee7ceb4931686ef9' 
  AND token = '0FcMDSOylt/nb938UPqvSevVISG0WVvSkeavzh+zw20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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