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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf69b6ced9025e061785970265769e5f1b0bd1bcc80e4e56bd594706fe56e4a4' 
  AND token = 'MnsKynH6tMYPI1fhppgqWOTdn16S8UpLB/v0XZsIu7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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