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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd1cda32046d8c89500823ca128b05ce1f994ec5eeed72f8b3985528791740b' 
  AND token = 'Sq3BAyb+gfmuin7+6lfOKO0NO5kkG/h7HWC87Qh76gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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