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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e32ab610ee3bbff8fde7a800e9da3490c156c2fd54bb37d6a144fbca5f0b6e' 
  AND token = 'dmv/KkMY8xhI3fGbblHUkHvGxVM5n2SNFEfOho8s/1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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