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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c1f4daf8e44a4038ec3463423e54984b80208c06bac7eb1a6d1998cbc03ec4f' 
  AND token = 'zAzn4winuXP6MCJlCTE6iMLeMcTNlzIUFSeEohz6CRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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