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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '071cea5efaf6a9755deb4ccb1f33ef5fbc609bd0e3b002d19b346f65369dc00e' 
  AND token = 'y8RADp26k6G1Nmah0YHmaxhyD8nrntyHLYAN3CZdBt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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