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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '550f53413f2d56979bbddb513f7b5e9bc03cc6e2bc59b191effaa308d0ba6d23' 
  AND token = '1kvyepwezydEmpr3JJi4CdeiPGu9RdMUKtkhuGGeh9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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