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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0607bf4356e5b9a3255e508842dc9bc96c263bee0eece49e7e0c02ea069810' 
  AND token = '9nbZ1bYnB4YrGaygZ1lYl85xQ6kFhYHpBYQGvC+jCzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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