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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5b544ec783e0031625fe0eee44fe2e15db60f6c514a06724e978393c65f07ae' 
  AND token = 'HOdmckghg998oKxk0BhjVf55lNIPdr/NjRJKRIYldlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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