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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ecf9d6edb4366dfd80500eb0ed2cdb2624f0b108f8e8d7d905ee3dd907762a' 
  AND token = 'Dew68QS3tVivVqNqQb8+tDSkIrS1pO9AOkRMG81QqmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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