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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '82b81b436c91571b5db5367720fa544d4cce48986d004c986e42ae441c891faa' 
  AND token = '9TV4lKI4EFJ8rNYknJ+ody6tF5OWptAT2L2pDSshbJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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