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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7617838fa2851ebc553d15ef89003d8049acb5b99055731c5638bf7ef096a1cf' 
  AND token = 'SllGzUlV8TTWRNVBKGTnV5I42HXaVbAT8xvVn0byza4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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