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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa30aaf3e67318dddf874adcf3b5e01b2cc72acbec2b7f7a01f43c985ccf235' 
  AND token = 'rfqzzzXjpsjHgh+EnqpiufE8Xh5RD44FpUInGMGXRfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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