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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '965dc806d6138053a3d8ac6cc25d2ef8603a8ac4d0f742f5b70b4b9d532c9523' 
  AND token = '4ji9MvBcwRW7WaMOY9lOqQxA6EMFSqzPbHR0cOuXazM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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