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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb52571762d951f1dba46847855c8858b90f93c3b0ca9a96f4478a53c388f34' 
  AND token = 'yh0Z1n8j4aMnYxJLk3qZyiUXIZF4JHMq2XJD9duOFPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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