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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae02e8a7e566c5814ca52f7cfb7d1ef0dc187f796b2875810212469ca0e20d1' 
  AND token = 'MFyx7pJh2PyqQbYUbfgm6uPG3jWfx1KoBNAic6hbHfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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